{
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\begin{tabular}{l*{4}{c}}
\hline\hline
                    &\multicolumn{4}{c}{\specialcell{\;\;\;\;\; Drinking water fecal contamination \;\;\;\;\;}}\\\cmidrule(lr){2-5}
                    &\multicolumn{1}{c}{(1)}   &\multicolumn{1}{c}{(2)}   &\multicolumn{1}{c}{(3)}   &\multicolumn{1}{c}{(4)}   \\
\hline
Source fecal contamination&       0.242***&       0.224***&       0.245***&       0.225***\\
                    &     (0.015)   &     (0.015)   &     (0.015)   &     (0.015)   \\
Travel time hh-ws (mins, reported)&       0.015*  &       0.018** &       0.016** &       0.018** \\
                    &     (0.008)   &     (0.009)   &     (0.008)   &     (0.009)   \\
Observed storage    &       0.081***&       0.070***&               &               \\
                    &     (0.010)   &     (0.010)   &               &               \\
Constant            &      -0.012   &      -0.015***&      -0.023** &      -0.024***\\
                    &     (0.010)   &     (0.002)   &     (0.010)   &     (0.001)   \\
\hline
Treatment unit fixed effects&          No   &         Yes   &          No   &         Yes   \\
R2                  &        0.07   &        0.14   &        0.06   &        0.14   \\
Obs                 &        5728   &        5728   &        5729   &        5729   \\
\hline\hline
\end{tabular}
}
